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    <!-- 数组去重；

    ```js

    [1,1,1,2,2,3,4,5,6,3,4,2,4,1,] ---> [1,2,3,4,5,6]

    ``` -->
    <script>
        var arr = [1,1,1,2,2,3,4,5,6,3,4,2,4,1];
        for (var i = 0; i < arr.length; i++) {
            for (var j = i + 1; j <= arr.length;j++) {
                if (arr[i] === arr[j]) {
                    arr.splice(j,1);
                    j--;
                }
            }
        }
        console.log(arr);
    </script>
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